a) \( \left\{\begin{array}{l}y^{\prime \prime}-2 y^{\prime}+4 y=x e^{x} \\ y(0)=-1 \text { et } y^{\prime}(0)=2\end{array}\right. \) b) \( \left\{\begin{array}{l}y^{\prime \prime}+4 y^{\prime}+3 y=3 x^{2}-3 \\ y(0)=1 \text { et } y^{\prime}(0)=2\end{array}\right. \)

Determina las dimensiones de una caja \sin tapa con un volumen de 300 cm³ que minimizan el área superficial, utilizando relación entre largo, ancho y alto.

A car's velocity is given by the function \( v(t) = 5t^2 + 3 \). Calculate the distance traveled by the car from time \( t = 0 \) to \( t = 4 \).

\( \int e ^ { \frac { - 1 } { x } } d x \)

A hotdog vendor must pay a monthly fee to operate a food cart in the city park. The cost in dollars of selling \( x \) hundred hotdogs in a month can be approximated by \( \mathrm{C}(\mathrm{x})=150+60 \mathrm{x} \). Complete parts (a) through (d) below. (a) Find the average-cost function. The average-cost function is \( \overline{\mathrm{C}}(\mathrm{x})=\square \) (b) Find and interpret the average cost at sales levels of 1000 hotdogs and 5500 hotdogs. The average cost at sales levels of 1000 hotdogs is \( \$ \square / 100 \) hotdogs. (Round to the nearest cent as needed.) The average cost at sales levels of 5500 hotdogs is \( \$ \square / 100 \) hotdogs. (Round to the nearest cent as needed.) Interpret these results, choose the correct answer below. Take the sales level of 1000 hotdogs as an example. Select the correct choice below and fill in the answer box to complete your choice. A. At a sales level of 1000 hotdogs, the average cost is \( \$ \square \) per 100 hotdogs. B. At a sales level of 1000 hotdogs, if an additional 100 hotdogs are sold, the average cost increases by approximately \( \$ \square \) per 100 hotdogs.

A hotdog vendor must pay a monthly fee to operate a food cart in the city park. The cost in dollars of selling \( x \) hundred hotdogs in a month can be approximated by \( \mathrm{C}(\mathrm{x})=150+60 \mathrm{x} \) Complete parts (a) through ( d\( ) \) below. Interpret these results, choose the correct answer below. Take the sales level of 1000 hotdogs as an example. Select the correct choice below and fill in the answer box to complete your choice. A. At a sales level of 1000 hotdogs, the average cost is \( \$ 75 \) per 100 hotdogs. (c) Find the marginal average-cost function. The marginal average-cost function is \( \bar{C}^{\prime}(x)=\square \) (d) Find and interpret the marginal average cost at sales levels of 1000 hotdogs and 5500 hotdogs. The marginal average cost at sales levels of 1000 hotdogs is \( \$ \square / 100 \) hotdogs) \( { }^{2} \). (Round to the nearest cent as needed.)